Heat exchange apparatus and heat pump apparatus

Abstract

A heat exchange apparatus according to the present disclosure includes a refrigerant supply source, an ejector, an extractor, a first pump, a second pump, a cooler, and a liquid passage. The first pump is a dynamic pump and disposed on the liquid passage between the extractor and the cooler. The second pump is a positive displacement pump and disposed on the liquid passage between an outlet of the first pump and an inlet of refrigerant liquid of the ejector.

What is claimed is: 
     
         1 . A heat exchange apparatus comprising:
 a refrigerant supply source that supplies a refrigerant vapor, the refrigerant vapor being a refrigerant in a vapor phase;   a cooler that cools a refrigerant liquid and that supplies the cooled refrigerant liquid, the refrigerant liquid being the refrigerant in a liquid phase;   an ejector that produces a refrigerant mixed flow using the refrigerant vapor supplied from the refrigerant supply source and the cooled refrigerant liquid supplied from the cooler;   an extractor that receives the refrigerant mixed flow from the ejector and extracts the refrigerant liquid from the refrigerant mixed flow;   a liquid passage that constitutes a loop on which the extractor, the cooler and the ejector are disposed in this order and that circulates the refrigerant liquid flowing therein;   a first pump that is a dynamic pump, that is disposed on the liquid passage between the an outlet of the extractor and an inlet of the cooler, and that pumps the liquid refrigerant from the extractor to the cooler; and   a second pump that is a positive displacement pump and that is disposed on the liquid passage between an outlet of the first pump and an inlet of the ejector.   
     
     
         2 . The heat exchange apparatus according to  claim 1 , further comprising:
 a third pump that is a dynamic pump and that is disposed on the liquid passage between the outlet of the first pump and inlet of the second pump.   
     
     
         3 . The heat exchange apparatus according to  claim 1 , wherein
 the second pump is disposed on the liquid passage between the outlet of the first pump and an inlet of the cooler.   
     
     
         4 . The heat exchange apparatus according to  claim 1 , wherein
 the first pump is located at a lowest level in a vertical direction on the liquid passage.   
     
     
         5 . The heat exchange apparatus according to  claim 1 , wherein
 the first pump and the second pump are located at an identical level in a vertical direction.   
     
     
         6 . The heat exchange apparatus according to  claim 1 , wherein
 the first pump has a required net positive suction head smaller than a required net positive suction head of the second pump, and   the first pump has a width of pressure increase larger than the required net positive suction head of the second pump.   
     
     
         7 . The heat exchange apparatus according to  claim 1 , wherein
 the second pump has a pump efficiency higher than a pump efficiency of the first pump.   
     
     
         8 . The heat exchange apparatus according to  claim 1 , wherein
 a saturation vapor pressure at a temperature of 20° C±15° C. of the refrigerant is lower than an atmospheric pressure.   
     
     
         9 . A heat pump apparatus comprising:
 the heat exchange apparatus according to  claim 1 , wherein   the refrigerant supply source is a compressor that compresses a refrigerant vapor input to the refrigerant supply source and that outputs the compressed refrigerant vapor to the ejector.   
     
     
         10 . The heat pump apparatus according to  claim 9 , further comprising:
 an evaporator that generates the refrigerant vapor to be supplied to the compressor; and   a liquid back passage that connects the extractor and the evaporator and that flows a refrigerant liquid that has an amount equal to the refrigerant that was output from the evaporator and that was supplied to the extractor via the compressor and the ejector.